I have this exact problem too. I am playing a Breton. I have tried the player.setscale solution posted, sadly it didn't help. But I've noticed a symptom or two I'll add here in case it helps someone more savy than me to figure this out. 1) The stuckness in 3rd happens only when I stay still, and look down with the controller (weapons sheathed) and then try to move. If I hold the stick for a few seconds (about 5 but it varies) I'll be able to move again, if I come to a stop I get stuck. Switching to 1st person allows me to move immediately, back to third and I am stuck, until I hold the move stick. Spining the camera seems to help unstuck. 2) I've noticed that the vertical camera axis speed is extremely slowed when stationary and looking down to get the stuck effect to happen. (edit: I'm not encumbered, never was) Edit Fixed: I had in my skyrim.ini blockframerate=0 so that I could run beyond 60fps. I tried putting it to 1 loaded the game and I can look down without getting stuck. Also the camera slowdown when looking down isn't as strong as it was. very strange..
